I’ve stuck with the built in mail app for my iPhone 7, it works OK for my purposes, most of the time.
Every now and again if I delete or move emails in Outlook on my desktop, they will stay in my Inbox on my iPhone. I will update, refresh, restart all of that and nothing works.
I was removing my Outlook account from the phone and putting it back, but I’ve found an easier way.
- Make sure the mail app is at the mailboxes screen, where you choose which mailbox or inbox to open.
- Switch to Settings
- Tap Mail
- Tap Accounts
- Tap Outlook
- Turn off Mail, go back to Mailboxes and check Outlook has been removed.
- Switch back to Settings
- Turn Mail on again.
- Switch back to Mailboxes and Outlook should be there again and syncnorized with the server.